Slippery, temperature stable, long wearing, non-foaming suspension fluid is the heart of a "no compromise" suspension setup. Race Tech Ultra Slick Suspension Fluid is a blend of aerospace fluids and additives that gives outstanding results. Features: A unique blend of pure synthetic fluids for the ultimate in antifriction riding, wear resistance and temperature stability Fade resistance in high-performance shock applications; 400+ viscosity index Change intervals are four to five times longer Light is recommended for KYB cartridge forks from 1990 to present, Showa cartridge forks, KYB shocks and WP shocks Medium is recommended for non-cartridge forks, pre-1990 KYB forks, Showa shocks, Ohlins shocks and forks and WP forks Light 85 SUS (5W)